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CVE-2026-13506 is an uncontrolled-recursion vulnerability in Bouncy Castle for Java's lazy ASN.1 sequence processing. Forcing a lazy sequence resets the nesting-depth guard, allowing crafted ASN.1 input to bypass the intended recursion limit and potentially cause denial of service. Affected releases include Bouncy Castle for Java before 1.85, Java LTS before 2.73.12, and Bouncy Castle for Java FIPS before 1.0.2.7 in the 1.0.x series, 2.0.2 in the 2.0.x series, and 2.1.3 in the 2.1.x series.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A nesting-depth guard reset vulnerability in Bouncy Castle's lazy ASN.1 sequence processing. The supplied CVSS vectors indicate remotely exploitable availability impact without authentication or user interaction, with no confidentiality or integrity impact. Severity is high: CVSS v3 7.5 and CVSS v4 8.7. The plugin recommends updating org.bouncycastle:bc-fips and related packages to version 1.0.2.7 or later; fixes were published September 28, 2026.
A Bouncy Castle for Java flaw where forcing a lazy ASN.1 sequence resets the nesting-depth guard, affecting Bouncy Castle Java, LTS, and FIPS package variants before their specified fixed releases.
A high-severity denial-of-service vulnerability in Bouncy Castle Java libraries where a lazy ASN.1 sequence can reset the nesting-depth guard, affecting BC-JAVA, BC-LTS-JAVA, and BC-FJA before the listed fixed versions.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.